Binocular



Nov'. 4 1924, Y 1,514,419

P. J. BERGGREN BINOCULAR i Filed Sept. 16 1918 2 Shoots-Sheet 1 l l. /Ja.f3

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P. ,1. BERGGREN BINOCULAR Filed Sept. 16 1918 2 Shasta-Sheet 2 PatentedNov. 4, 1924.

UNITED STATES PATENT .OFFlCE.

'.BINOCULAR.

Application led September 16, 1918. Serial No. 254,261.

To all whom t may concern? Be it known that I, PER J oHAN BERGGREN, asubjectof the King of Sweden, residing at Chlcago, in the county ofCookand State 'l of Illinois, have invented certain new. and usefulImprovements in Binoculars, of which the following is a specification.

Telescopes of the type commonly known as binoculars have heretoforeusually been made with cast metal barrels or` body pieces, and theobjective and ocular tubes were usually made of hard rubber or liberwhich is more or less apt to be easily cracked or broken. Furthermore inthe usual construclll tion of these binoculars. the prisms are mountedin the barrels so that they require exceedingly careful adjustment, andin fact the whole construction is so complicated that it requires anexpert to be able to take one of these instruments apart for the purposeof cleaninguthe same and again assembling it so that it may be used.These disadvan-Y tages are particularly apparent where the devices aresubjected to comparatively rough usage as for the Army andi Navypurpose,

or the like.

The present invention relates particularly to improvements in thegeneral construction of such binoculars, and more particularly to thesimplification and arrangement ofthe parts so that they may be readilyconstructed and assembled.

The objects ofthis invention are to provide an improved form ofbinocular; to pro- I6 vide a binocular telescope in which the principalparts are formed of drawn or pressed sheet metal; to provide a binocularwhich may be readily taken apart for cleaning and again assembledwithout the necessity of special adjustments; and inl general to providesuch an improved construction as will appear more fully from thefollowing description taken in connection with the accompanyingdrawings. As shown in these o, drawings;

Fig). 1 is a side view, partially in section,

of a inocular embodying'the principal features of this invention;

Fig. 2 is an end view of the same from the ocular end; 1

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 2;

Fig. lluis an end view taken from the obj active end with partsv shownin section;

Fig. 5 is a sectional view taken on the line 5-5 of Fig. l;

Figs. 6 and 7 are details of the prism bracket or holder; and,

Fig. 8 is a lfragmentary view showing a modified form of construction.

In accordance with .my invention, the

binocular is provided with barrels or body portions 9 which arepreferably formed of sheet metal as by drawing or pressing, or may beformed from tubing by shaping the same to the proper configuration.These barrels are provided with end pieces or closures 10 and 11 whichare also drawn or stamped from sheet metal and are provided with arms orprojections 12 and 13 res ctively for hinging the barrels together. heheads or end piecesare preferably provided with flanges 14 and 15 whichfit over the ends of the barrel, and the parts are secured together bymeans of screws 16 or. the like. The hinge arms 12 and 13 are providedwith holes 17 for receiving a pintle 18. A yspreader tube or sleeve 19fits over the pintle 18 and washers 20 are preferably ar! ranged ateither side of the hin e arms. Screws 21 are inserted in the en s of thepintle and holds the parts together, as shown in Fig. 3. By means ofthis hin e arrangement, the pupillary distance may e readily adjustedand the friction will hold the parts in adjusted position.

The objective tubes 22 are also preferably formed from tubing or drawnfrom sheet metal and threaded at their inner ends, as indicated at 23,to engage with the correspondingly threaded holes 24 in the barrel ends10. These tubes are preferably shouldered, as indicated at 25, so thatthe will be in fixed position when inserted. his shoulder also serves tofix the position of the objective or lens 26 which is held in positionby means of a threaded ring 27 which engages with the correspondinglythreaded end of the tube 22.

-The prisms 28 and -29 are mounted in a bracket or holder 30 which isalso preferably stamped orformed from sheet metal. This bracket orholder, as shown in Figs. 6 and 7 comprises a transverse plate 31 withholes 32 for the passage of the rays of light. This plate has oppositelyarranged, somewhat semi-circular flanges 33 and 34 for receiving andsupporting theprisms'28 and 29 respectively. Clips or tabs 35 and 36 arealso preferably provided for engagement with the ends of the respectiveprisms. These by means of fingers or locking pieces 38 and 39. Thesefingers are preferably made of springs or resilient material so thatthey will hold the prisms securely against the plate 30. These'springfingers are secured to the flanges 33 and 34 by means of screws 40 or inany other convenient manner. The prism brackets or holders 30 fitclosely within the barrels 9 and are held in position by means of screws41 or other similar fastening means and it will be seen that thesebrackets With the prisms therein may be readily removed from thebarrels.

The ocular tubes 42 are also preferably made entirely of metal with theparts drawn or stamped, and are constructed so as to give the properadjustment` for focusing the instrument. These tubes are composed ofmain cylindrical members 43 which are provided with reduced inner ends44 to form outer and inner shoulders. These reduced ends are threaded tocorrespond with threaded engaging flanges 45 which extend inwardly fromthe ends or-covers 11. A second tube 46 fits in the tube 43 and isrovided at its outer end with a flange 47 or en agement with the lens48. A third tube 49 ts in the tube 46 and is provided with a fiange 50which co-acts with the flange 47 for holding the lens 48. The lens 51fits in the tube 43.

and rests against the end of the tube 49. A threaded ring 52 engageswith 'the correspondingly threaded end of the tube 46 and h olds'theparts contained therein in position. The eye piece 53 is secured in theendA of a sleeve 54 which extends down over the tube 43 and ispreferably knurled, as indicated at 55, for turning the same. The tube43 is provided with `a cam slot 56, and a screw 57 passes through thesleeve 54 and through this slot and engages with the tube 46 therebyconnecting the lens supporting tube with the adjusting sleeve, thearrangement. being such that when the sleeve is turned, the'screw willride along the cam and cause the ocular lenses to be adjustedlongitudinally. Y

l From this'description it will be seen that I, provide an improved formof binocular which maybe constructed almost entirely out of drawn orstamped metal and the parts-formedl so that vthey may be assembledWithout the necessityof diflicult and tedious ad] ustments. h The oculartubes being formed 1n the manner 'described are particularly stronandserviceablev and are not apt to be injured even by rough treatmentsuch as isp-apt to occur when 'the instruments are used for warpurposes.It will also be noted that the parts may be `readily taken apart withoutthe aid of any special tools and may again be quickly assembled even bythe most inexperienced person. For thls reason if the lenses or prismsbecome dirty or if the instrumentshould be dropped in' the water or mud,it may be readily taken apart and cleaned and again assembled in a veryshort time, whereas withv the present well known forms of binoculars.this isusually an operation which requlres the shown in Fig. 8, theprisms are held in sepa- -rate brackets instead of in a single bracketas in the form described. In this instance the prism 58 is held in abracket 59 which is mounted in the 'barrel 60 and is held by means ofone or more screws 61. The prism 62 is mounted in a bracket 63, which isheld in position by one or more screws 64 as will be readily apparentfrom the drawing.

, Various changes may be made in the parv -ticular form and arrangementof arts without departing from the scope of this invention, andtherefore, I do` not wish to be limited to the exact construction orarrangeinent above described, but what I claim and desire to secure byLetters Patent is:

1. A binocular comprising barrels formed of drawn metal with end plateshaving flanges extending around substantially the entire peripherythereof, one end of each of said plates being adapted to fit over theend of one of the barrels, the opposite ends of the plates which are notflanged, being overlapped to form hinges, a pintle connecting saidoverlapping ends, stamped metallic brackets secured in said barrels,prisms mounted in said brackets, spring fingers sev cured to saidbrackets for holding said prims in position, objective tubes and oculartubes formed of drawn metal parts, mounted in said barrels, said tubescontaining the nec,

prisms ,for holding them in-positiom t rough 3. An ocular device of thecharacter set forth, comprising a relatively fixed tube with a cam slottherein, an inner sleeve having a. flanged outer end, a second sleevehaving a flanged outer end and fitting in the firstnamed sleeve, a lenspositioned between said flanges and held thereby, a second lens restinagainst the inner end of the last name sleeve, a ring for holding saidlenses and the last named sleeve in position, an`

eyepiece engaging said first named sleeve, an outer a justing sleevecarried by said e epiece, and a. screw or the like passing the adiustingsleeve and engaging said slot.

4. Anocular tube construction comprising a tube formed of drawn metaland having a' reduced inner end forming outer and inner shoulders, saidreduced end lbeing threaded to engage with the barrell of a binocular, aflanged sleeve fitting in said tube, a second flanged sleeve in saidfirst named sleeve, a lens carried betweensaid' flanges, a second lensfittin in said first named sleeve and restinga alnst the end of thesecond sleeve, a rin or holding said lenses and second sleeve 1nposition, aul eyeieee secured to the first sleeve, an outer ad- ]ustingsleeve secured to said eyepiece .and meansfor adjusting the sleeveslongitudi nally of the tube. d i

5. The combination with a telescope' barrel, of a prism holder adaptedtofit closely within the barrel, non-adjustable means for securin theholder in position, said holder` being mgiapted to support two prisms,one on either side thereof, and having flanges for engagement with thesides of the prisms and 'with the sides of the barrel to preventlatengage with the prisms for holding them position.

PER JOHAN BERGGREN;

